BIG Filing for Chapter 11 and Ceasing all Operations, page-331

"So the purpose of this action is only to realise the loss?" - Yes. It helps people avoid the perverse situation where they may need to pay a crapload of capital gains tax in one year knowing it's only a matter of time before a company is wound up and they realise a tax loss.

"They dun pay you anything to acqurie the shares from u?" - No. You actually pay them a fee for them to acquire your worthless shares.

Their fees are described here:

https://www.delisted.com.au/sell-your-worthless-shares